Tribe Suspected in Death of American in India Among Most Isolated

John Allen Chau, 27, ventured onto the island last week, reportedly on a mission to convert them, despite warnings by fishermen who took him there. Indian authorities announced Wednesday that he had apparently been killed with arrows.

The tribe, believed to have migrated from Africa some 50,000 years ago, guards its isolation so fiercely that experts have gathered very limited knowledge about it.